Large-pipe-diameter tap water pipeline protection construction structure

Abstract

The utility model provides a large-pipe-diameter tap water pipeline protection construction structure which is characterized in that a pipeline is arranged above an underpass tunnel four-hole frame structure in a striding mode, two rows of longitudinal beams are arranged on the two sides of the pipeline respectively and fixedly erected by seven cover beams jointly, and two rows of fender posts are arranged on the two sides of the four-hole frame structure respectively. The positions corresponding to the three middle walls are each provided with a set of latticed columns according to the same structural form, the seven cover beams are correspondingly arranged according to the positions where the four columns of fender posts and the three sets of latticed columns are located, and the two columns of longitudinal beams, the seven cover beams, the corresponding fender posts and the corresponding latticed columns form a complete frame supporting system. The pipeline protection construction structure is arranged based on the frame supporting system and comprises first-class protection construction structures at socket and spigot joints between pipelines; a second type of protection construction structure is arranged at each standard knot of the pipeline; and a third-class protection construction structure is arranged at the position where the pipeline encounters the pile. According to the utility model, the pipeline is protected in situ without being changed, the safety of the water supply pipeline and construction is ensured, the construction cost is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a large-diameter tap water pipeline protection construction structure. Background Art

[0002] The tunnel project requires pipeline protection during foundation pit excavation. The traditional approach is to relocate the pipeline first, then excavate and construct the main structure of the tunnel. Pipeline protection is already faced with the problem of complex technology and complicated procedures. This approach requires the re-laying of new pipelines, which restricts the construction progress of the tunnel and increases construction costs. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes a large-diameter tap water pipe protection construction structure, which provides a new construction idea for pipeline protection projects. It protects the pipeline in situ without the need for relocation or laying of new pipelines, ensuring uninterrupted water supply without pressure reduction, ensuring the safety of water supply pipelines and construction, while reducing construction costs and improving production efficiency.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A large-diameter water pipe protection construction structure, which has the following structural features: the pipe is spanned above a four-hole frame structure passing through a tunnel; two rows of longitudinal beams laid along the length of the pipe are arranged on both sides of the pipe, leaving space between the two rows of longitudinal beams and the transverse direction of the pipe; the two rows of longitudinal beams are fixedly erected by seven transversely laid cap beams; the top elevation of the cap beam is set in accordance with the bottom elevation of the pipe at the position; two rows of retaining piles are arranged on both sides of the four-hole frame structure; a group of lattice columns are arranged at the positions of the three middle walls in accordance with the same structural form; the position distribution of the seven cap beams is arranged in accordance with the positions of the four rows of retaining piles and the three groups of lattice columns; the two piles of each row of retaining piles are raised and fixedly supported at the two ends of the bottom of the corresponding cap beam; the two columns of each group of lattice columns are fixedly supported at the two ends of the bottom of the corresponding cap beam; the two rows of longitudinal beams, the seven cap beams, the corresponding retaining piles and the lattice columns form a complete frame support system; the pipe protection construction structure is set based on the frame support system, including:

[0006] The first type of protective construction structure at each socket joint between pipelines is composed of a first steel casing, a first suspension structure, and a first fireproof rock wool layer. The first steel casing is composed of two first sub-casings split into two along the central axis direction and spliced ​​through a flange via a first round steel screw. It is tightly fitted on the socket joints of two adjacent sections of the pipeline, and a first fireproof rock wool layer is arranged between the outer wall of the pipeline, and the bottom end is tightly attached to the corresponding cap beam. The first suspension structure includes a first suspension beam and a plurality of the first round steel screws. The first suspension beam is fixedly mounted between the top ends of a plurality of support members spaced apart along the lengthwise direction at the top ends of two rows of longitudinal beams. The first round steel screw thread is vertically penetrated between the first suspension beam and the flange of the first steel casing, and is respectively fastened by a first nut;

[0007] The second type of protection construction structure at each standard section of the pipeline is distributed in multiple groups at equal intervals along the length of the pipeline on the standard section of the pipeline between two adjacent first type protection construction structures. Each group is composed of a second steel casing, a second suspension structure, and a second fireproof rock wool layer. The second steel casing is composed of two second sub-casings that are split into two parallel to the axial direction and spliced ​​through a flange through a second round steel screw. It is tightly fitted on the standard section of the pipeline, and a second fireproof rock wool layer is arranged between the outer wall of the pipeline. The bottom end is tightly attached to the corresponding cap beam. The second suspension structure includes a second suspension beam and a plurality of second round steel screws. The second suspension beam is fixedly mounted between the tops of a plurality of supporting members spaced apart along the length at the tops of the two rows of longitudinal beams. The second round steel screw thread is vertically penetrated between the second suspension beam and the flange of the second steel casing, and is respectively fastened by a second nut;

[0008] The third type of protective construction structure at the location where the pipeline meets the pile column is tightly supported on the bottom end of the pipeline by a cap beam, and the gaps on both sides along the horizontal direction between the cap beam and the bottom end of the pipeline are filled with wedge-shaped wooden blocks.

[0009] The structural features of the utility model also lie in:

[0010] The diameter of the tap water pipe is DN1200mm, and the first steel casing and the second steel casing are both rolled from steel plates with a diameter of 1400mm and a thickness of 10mm.

[0011] The first steel casing covers a length range of 2 m along the length of the pipeline. The second steel casing covers a length range of 0.6 m along the length of the pipeline.

[0012] The first fireproof rock wool layer surrounds the outer wall of the pipe and tightly covers the outer wall of the pipe at the socket joint. It is a 10cm thick fireproof rock wool. The second fireproof rock wool layer surrounds the outer wall of the pipe and tightly covers the outer wall of the pipe at the standard section. It is a 10cm thick fireproof rock wool.

[0013] The supporting structure includes a steel pad and an I-beam. A section of the I-beam is erected, and the bottom end is welded to the longitudinal beam through a steel pad. It is as wide as the longitudinal beam, inserted into the soil layer to a depth of 4.5m, and the top elevation is 0.1m higher than the top elevation of the pipeline.

[0014] Corresponding to the first type of protective construction structure at each socket joint, multiple supporting members are arranged at intervals within a length of 1.5m along the long direction of the pipeline; corresponding to the second type of protective construction structure at each standard section, multiple supporting members are arranged at intervals within a length of 0.5m along the long direction of the pipeline.

[0015] Compared with the existing technology, the utility model takes into account both economy and convenience, has good construction effect, and its beneficial effects are embodied in:

[0016] The utility model breaks the inherent thinking of pipeline relocation, proposes a new technology for on-site protection of pipelines, reduces the amount of pipeline relocation engineering, can provide uninterrupted water supply without reducing pressure, completes the task of tap water pipeline protection, greatly reduces the cost of pipeline protection construction, and greatly simplifies the original cumbersome and time-consuming relocation construction steps, making pipeline protection construction more convenient, speeding up construction progress, improving construction quality, reducing safety risks, and helping to reduce project costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional elevation schematic diagram of the utility model;

[0018] Figure 2 It is a schematic diagram of the plan layout of the utility model;

[0019] Figure 3 It is a cross-sectional schematic diagram of the first type of protected construction structure;

[0020] Figure 4 It is a cross-sectional schematic diagram of the third type of protection construction structure;

[0021] Figure 5 This is a schematic diagram of the steel casing half pipe and pier installation structure.

[0022] In the figure:

[0023] 1 pipe; 11 socket joint; 12 standard section; 2 longitudinal beam; 3 cap beam; 4 retaining pile; 5 lattice column;

[0024] 6 first type of protective construction structure; 61 first steel casing; 611 flange; 62 first suspension beam; 63 first round steel screw; 631 rubber pad; 64 first fireproof rock wool layer;

[0025] 7 The second type of protection construction structure;

[0026] 8 wedge-shaped wooden blocks;

[0027] 9 supporting member; 91 steel plate; 92 I-beam;

[0028] 101 four-hole frame structure; 102 slope; 103 pier; 104 steel sleeve half pipe; 105 horizontal flange; 106 anchor bolt. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Please refer to Figures 1 to 4 The pipeline 1 is arranged above the four-hole frame structure 101 of the tunnel. Two rows of longitudinal beams 2 are laid along the length of the pipeline 1 and are arranged on both sides of the pipeline 1, leaving a space between the two rows of longitudinal beams 2 and the pipeline 1 in the horizontal direction. The two rows of longitudinal beams 2 are fixedly erected by seven cap beams 3 laid in the horizontal direction. The top elevation of the cap beam 3 is set according to the bottom elevation of the pipeline 1 at the location. Two rows of retaining piles 4 are arranged on both sides of the four-hole frame structure 101, and a group of lattice columns 5 are arranged at the same structural form corresponding to the positions of the three middle walls. The position distribution of the seven cap beams 3 is arranged according to the positions of the four rows of retaining piles 4 and the three groups of lattice columns 5. The two piles of each row of retaining piles 4 are raised and fixedly supported at the two ends of the bottom of the corresponding cap beam 3. The two columns of each group of lattice columns 5 are fixedly supported at the two ends of the bottom of the corresponding cap beam 3. The two rows of longitudinal beams 2, the seven cap beams 3, the corresponding retaining piles 4, and the lattice columns 5 form a complete frame support system. The large-diameter tap water pipeline 1 protection construction structure of this embodiment is set based on the frame support system, including:

[0031] The first type of protective construction structure 6 at each socket joint 11 between pipelines 1 is composed of a first steel casing 61, a first suspension structure, and a first fireproof rock wool layer. The first steel casing 61 is composed of two first sub-casings split into two along the central axis direction and spliced ​​through a flange 611 and a first round steel screw 63. It is tightly fitted on the socket joints 11 of two adjacent sections of the pipeline 1, and a first fireproof rock wool layer is arranged between the outer wall of the pipeline 1. The bottom end is tightly attached to the corresponding cap beam 3. The first suspension structure includes a first suspension beam 62 and a plurality of first round steel screws 63. The first suspension beam 62 is fixedly mounted between the top ends of a plurality of support members 9 spaced apart along the lengthwise direction at the top ends of the two rows of longitudinal beams 2. The first round steel screw 63 is threadedly vertically penetrated between the first suspension beam 62 and the flange 611 of the first steel casing 61, and are respectively fastened by first nuts;

[0032] The second type of protection construction structure 7 at each standard section 12 of the pipeline 1 is distributed in multiple groups at equal intervals along the length of the pipeline 1 on the standard section 12 of the pipeline 1 between two adjacent first type protection construction structures 6, and each group is composed of a second steel casing, a second suspension structure, and a second fireproof rock wool layer. The second steel casing is composed of two second sub-casings that are split into two parallel to the axial direction and spliced ​​through a flange 611 through a second round steel screw, and is tightly fitted on the standard section 12 of the pipeline 1. A second fireproof rock wool layer is arranged between the outer wall of the pipeline 1, and the bottom end is tightly attached to the corresponding cap beam 3. The second suspension structure includes a second suspension beam and a plurality of second round steel screws. The second suspension beam is fixedly mounted between the top ends of a plurality of support members 9 spaced apart along the length at the top ends of the two rows of longitudinal beams 2. The second round steel screw thread is vertically penetrated between the second suspension beam and the flange 611 of the second steel casing, and are respectively fastened by second nuts;

[0033] The third type of protective construction structure at the position where the pipeline 1 meets the pile column is tightly supported on the bottom end of the pipeline 1 through the cap beam 3, and the gaps on both sides along the horizontal direction between the cap beam 3 and the bottom end of the pipeline 1 are filled with wedge-shaped wooden blocks 8.

[0034] In a specific implementation, the corresponding structural setting of the large-diameter water pipe 1 protection construction structure also includes:

[0035] The diameter of the tap water pipe 1 is DN1200mm, and the first steel casing and the second steel casing are both rolled from steel plates with a diameter of 1400mm and a thickness of 10mm.

[0036] The first steel casing covers a length range of 2m along the length of the pipeline 1, and the second steel casing covers a length range of 0.6m along the length of the pipeline 1. The structural form of the first type of protection construction structure 6 is roughly the same as that of the second type of protection construction structure 7. The difference lies in the different coverage length ranges of the steel casing along the length of the pipeline 1. In this regard, the first steel casing 61 can be configured with multiple groups of first suspension structures spaced apart along the length to complete the suspension protection at the socket joint, while the standard section 12 is configured with multiple second type of protection construction structures 7 to complete the suspension protection of this section of the pipeline 1. Therefore, the cross-sectional structure of the second type of protection construction structure 7 can be referred to. Figure 3 .

[0037] The first fireproof rock wool layer surrounds the outer wall of the pipe 1 and is tightly wrapped around the outer wall of the pipe 1 at the socket joint 11. It is a 10 cm thick fireproof rock wool. The second fireproof rock wool layer surrounds the outer wall of the pipe 1 and is tightly wrapped around the outer wall of the pipe 1 at the standard section 12. It is a 10 cm thick fireproof rock wool.

[0038] The supporting member 9 includes a steel pad 91 and an I-beam 92. A section of the I-beam 92 is erected, and the bottom end is welded to the longitudinal beam 2 through the steel pad 91. It is the same width as the longitudinal beam 2, inserted into the soil layer to a depth of 4.5m, and the top elevation is 0.1m higher than the top elevation of the pipeline 1.

[0039] Corresponding to the first type of protective construction structure 6 at each socket joint 11, multiple supporting members 9 are arranged at intervals within a length of 1.5 m along the long direction of the pipeline 1; corresponding to the second type of protective construction structure 7 at each standard section 12, multiple supporting members 9 are arranged at intervals within a length of 0.5 m along the long direction of the pipeline 1.

[0040] The design idea of ​​this embodiment is: using the partition wall (900mm thick) and the anti-pulling pile structure between the four-hole frame structure 101 of the tunnel, in addition to raising the retaining piles 4 on both sides of the frame to the bottom of the cap beam 3, three groups (6) of lattice columns 5 located at the middle wall position of the frame are added for support, and pile foundation abutments are added at the ends of the two slopes 102 to support the water pipes at the corresponding positions. The entire protection is divided into a six-span structure, and seven cap beams 3 are set at the pile column position, passing through the lower part of the water pipe 1 and ensuring that the top of the cap beam 3 is closely attached to the water pipe 1. Longitudinal beams 2 are set on both sides to ensure that the longitudinal beams 2, the cap beams 3 and the supporting piles (lattice columns 5) form a complete frame support system. The ductile iron water pipe 1 is reinforced at the socket joint and 12 standard sections by using a steel casing made of a 1400mm diameter and 10mm thick steel plate, and a suspension protection is added. The pile column position is protected by the cap beam 3 plus a wedge-shaped wooden block 8.

[0041] During construction, as an application example, you can refer to the following steps:

[0042] Step 1: Construction preparation

[0043] 1.1. Complete the review of design drawings in advance and sign off on the review materials;

[0044] 1.2. Prepare the pipeline 1 protection construction plan, review, approve and complete expert demonstration;

[0045] 1.3. According to the construction plan, set control points, measure elevation level points, and lay out the excavation range of the foundation pit;

[0046] 1.4. Organize relevant management personnel to carefully study technical specifications, standards, and process procedures before construction, and be familiar with the construction plan, drawings, and underground soil and hydrogeological data of the site;

[0047] 1.5. Before construction, the site manager shall conduct targeted safety and technical briefings to all personnel participating in the construction, and each operator, especially the machine operator, must be aware of the technical requirements during construction;

[0048] 1.6. Before construction, the on-site construction personnel should be inspected for quality and given safety and technical briefings and training. At the same time, monthly briefings should be conducted to enhance the technical quality of the construction team;

[0049] 1.7. Prepare material plans for steel bars, concrete, lattice columns, etc., and corresponding test plans, and guide material ordering, supply and technical control;

[0050] 1.8. Remove the water from the site, level the site, and build drainage ditches and tertiary sedimentation tanks;

[0051] 1.9. Transportation distance and route: Before construction, the route, traffic control and smoothness of the soil should be understood. If necessary, multiple traffic routes should be found in advance, and the best route should be determined at any time to ensure the smooth progress of earthwork construction and set up a flushing platform pool;

[0052] 1.10. At the same time, complete the waste soil declaration procedures, coordinate the relationship between all parties, and ensure the smooth construction of the project;

[0053] 1.11. Earthwork excavation and transportation machinery should be repaired and maintained before and during construction. Professional maintenance personnel should be responsible for earthwork construction, and corresponding spare vehicles should be provided during earthwork construction;

[0054] 1.12. Temporary water and electricity are connected on site to prepare for foundation pit construction;

[0055] 1.13. Investigate the construction site and find out the site conditions, including the topography, landforms, geology and hydrology, transportation roads, adjacent buildings, underground pipelines, air-raid shelters, etc.

[0056] 1.14. According to the control coordinates and level points, the survey shall be conducted to the site in accordance with the requirements of the general plan, and the lines necessary for the operation of the proposed buildings and machinery shall be avoided and protected;

[0057] 1.15. All kinds of building materials piled in foundation pits and slopes should be piled at the specified distance. The distance between various construction machinery and foundation pits and slopes should be determined according to the weight of the equipment, the support of the foundation pits and slopes, and the soil conditions, and should not be less than 5m. The control measurement and verification of the positioning axis of the building should be carried out; the measurement and positioning of earthworks should be carried out, the gantry plates should be set, the gray lines of the foundation pit excavation, the upper and bottom side lines and level marks should be laid out. The gray lines, elevations and axis lines should be verified to be correct before the site leveling and foundation pit excavation can be carried out;

[0058] Step 2: Pipeline 1 support pile foundation construction

[0059] 2.1. Buried casing

[0060] The casing adopts a steel casing with a diameter 20-40cm larger than the designed pile diameter. The casing is made of 20mm steel plate. After the pile position is determined, the cross-cross method is used to make the pile protection; then the center of the pile position is taken as the center of the circle, and the casing position is determined on the soil according to the casing radius. A circular foundation pit 20cm larger than the casing is excavated, and the casing is placed into the excavated foundation pit by machinery, and pressure is applied to slowly press it in; the casing center is made consistent with the pile center by using the pile protection, and then clay is symmetrically backfilled around the casing and compacted; the top surface of the casing is about 30cm higher than the construction trench, and a drainage ditch is formed on one side of the construction trench as a channel for mud discharge and collection; during the burial process, the casing should be checked to see if it is vertical. If deflection is found, it should be corrected in time. After the casing is buried, the plane position deviation is not more than 5cm, and the inclination deviation is not more than 1%;

[0061] 2.2 Pile foundation construction

[0062] After the casing is buried, the supporting pile foundation is constructed using a rotary drilling rig; when drilling, the center of the drill bit is kept in line with the center line of the corresponding pile position;

[0063] 2.3. Installation of steel cage and lattice column 5

[0064] After the drilling of non-lattice column 5 piles is completed and the steel cage is installed, after the steel cage is hoisted, check the verticality and outer contour of the steel cage and put it into the inner steel cage smoothly and vertically. When it falls to the hole mouth, it is fixed with steel sections; after the drilling of lattice column 5 piles is completed, the mud and soil around the borehole are cleaned, the four coordinate points of the extended lines of the midpoints of the four sides of lattice column 5 are calculated, and then the lines are laid out, and the positioning deviation is less than 10mm; when the steel cage falls to the hole mouth, it is fixed with steel sections, and the lattice column 5 is hoisted into the steel cage for reinforcement connection; when the lattice column 5 is hoisted to the hole mouth, it is fixed with steel sections and connected to the guide column with bolts.

[0065] Step 3: Construction of transverse crown beam

[0066] The main reinforcement of the 1000×1000 transverse crown beam is 40 φ22mm threaded steel bars, with a transverse spacing of 100mm and a height spacing of 178mm; the stirrup reinforcement type is φ10mm round steel bar with a spacing of 100mm; the opposite tension reinforcement type is φ10mm round steel bar with a spacing of 200mm; before the construction of the transverse crown beam, the excavation edge line should be set out, the base elevation should be calculated, the excavation depth should be determined, and a 50cm working surface should be reserved on each side during excavation; manual + 60 small excavation is used for excavation, and it is divided into 2 excavations; the first excavation is carried out by a 60 excavator in cooperation with personnel, and the earthwork from the original ground to the bottom of the pipe is excavated with 6m steel sheet pile support + 60 excavator, and the excavation bottom width is 2.8m; the second time, the earthwork below the bottom of the pipe is excavated manually, and the 60 excavator transfers the earthwork, and the earthwork excavation is excavated from both sides to the bottom of the pipe;

[0067] Step 4: Installation of water pipe 1 protection construction structure

[0068] 4.1. Installation of 11 first-class protection construction structures 6 for each socket joint of 1 water pipe 1 pipe

[0069] First, clean the socket joint 11 of the water pipe 1, and then dig it manually. The digging width should be 10cm larger than the steel casing (2.0m×10mm) on each side, and the digging depth should be 20cm lower than the bottom of the pipe. After digging out the pipe 1 joint, professional workers will install it: a DN1400mm steel casing pipe section with a length of 2.0 meters, i.e., two first sub-casings, is divided into two parts and lifted by a fall chain from one side of the water pipe 1, and the first sub-casing at the bottom is inserted into the other side through the channel dug out from the bottom of the water pipe 1. After the first sub-casing is inserted, one end of the fall chain is fixed to the ground, and the first sub-casing is tightened by the fall chain to ensure close contact with the protected DN1200mm water pipe 1. A 10cm thick fireproof rock wool is added to the contact surface as a protective device for the anti-corrosion coating of the water pipe 1, and then the first sub-casing at the top is installed to align the flanges 611 of the two first sub-casings;

[0070] After the first steel casing 61 at the socket joint 11 of the water pipe 1 is installed, a φ36mm threaded steel bar (i.e., the first round steel screw 63) is passed through the flange 611 of the first steel casing 61 from bottom to top to prepare for the suspension protection of the socket joint 11 of the pipe 1 to prevent the pipe 1 from horizontal displacement;

[0071] 4.2. Installation of the second type of protection construction structure 7 at each standard section 12 of the water pipe 1

[0072] After the first suspension structure at the socket joint 11 is installed and stressed, the second type of protection construction structure 7 at the standard section 12 is installed. Manual excavation is also used. The excavation width should be 10 cm larger than the steel casing (0.6m×10mm) on each side. The excavation depth is 20 cm below the bottom of the pipe. After the pipe 1 joint is excavated, it is installed by professional workers. The installation method of the second steel casing refers to step 4.1;

[0073] After the second steel casing at the standard section 12 of the water pipe 1 is installed, a φ36mm threaded steel bar (i.e., the second round steel screw) is inserted from bottom to top at the flange 611 of the second steel casing to prepare for the suspension protection at the standard section 12 of the pipe 1 to prevent the pipe 1 from horizontal displacement;

[0074] Step 5: Construction of longitudinal beam 2

[0075] Concrete longitudinal beam 2 uses 2 reinforced concrete beams of 50300mm×800mm×1000mm. The foundation pit is excavated by 60 excavators in cooperation with personnel. The earthwork from the original ground to 20cm from the bottom of the crown beam and 20cm from the side of the pipeline is excavated by 60 excavators. The earthwork 20cm from the bottom of the crown beam and 20cm from the side of the pipeline is excavated manually and transported by excavators.

[0076] Step 6: Install the support member 9 and the remaining components of the first suspension structure and the second suspension structure

[0077] 6.1. Installation of support member 9

[0078] The support member 9 should be adjusted according to the elevation of the longitudinal beam 2 and the top of the pipeline 1 on site. The I-beam 92, the steel pad 91 and the longitudinal beam 2 of the support member 9 should be welded together, and the weld should be full. After welding, the top surface should be polished with a grinder to keep the top surface of the support member 9 flat.

[0079] 6.2. Installation of remaining components of the first suspension structure and the second suspension structure

[0080] After the concrete strength of the support beam meets 90% or more, the remaining components of the first suspension structure and the second suspension structure are installed in the same way. A double-jointed 25 I-beam 92 (i.e., the first suspension beam 62 or the second suspension beam) is welded and erected between the top surfaces of the support components 9 on both sides, and a φ36mm threaded steel bar (i.e., the first round steel screw 63 or the second round steel screw) is fastened to the double-jointed 25 I-beam 92 through a nut and a 20mm rubber pad 631, forming the first suspension structure and the second suspension structure to suspend and protect the water pipes at the socket joint and the standard section 12;

[0081] Step 7: Construction of Pipeline 1 Pier 103

[0082] Before pouring concrete for the top slab of the tunnel box culvert, the pier 103 steel bars are embedded according to the length of pipe 1 and the position of the joint of pipe 1, and the embedded position is prepared correctly. After the top slab of the box culvert is poured, the pier 103 steel bars are tied and the formwork is installed, and the concrete pouring is completed.

[0083] After the construction is completed, the protective construction structure of the large-diameter tap water pipe 1 of this embodiment can be dismantled and reused. After dismantling, anchor bolts 106 are pre-buried on the pier 103, and a steel sleeve half pipe 104 is sleeved on the outer wall of the tap water pipe above the top of the pier 103. The steel sleeve half pipe 104 is close to the exposed pipe wall of the tap water pipe, and has horizontal flanges 105 at both ends. It is attached to the top of the pier 103 through the horizontal flanges 105 and fastened by pre-buried anchor bolts 106. Figure 5 shown.

[0084] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A large-diameter water pipe protection construction structure, characterized in that: The pipeline is spanned above the four-hole frame structure of the underpass tunnel. Two rows of longitudinal beams laid along the length of the pipeline are arranged on both sides of the pipeline, leaving space between the two rows of longitudinal beams and the transverse direction of the pipeline. The two rows of longitudinal beams are fixed and erected by seven cap beams laid along the transverse direction. The top elevation of the cap beam is set in accordance with the bottom elevation of the pipeline at the location. Two rows of retaining piles are arranged on both sides of the four-hole frame structure. A group of lattice columns are arranged at the positions of the three middle walls in the same structural form. The position distribution of the seven cap beams is arranged in accordance with the positions of the four rows of retaining piles and the three groups of lattice columns. The two piles of each row of retaining piles are raised and fixedly supported at the two ends of the bottom of the corresponding cap beam. The two columns of each group of lattice columns are fixedly supported at the two ends of the bottom of the corresponding cap beam. The two rows of longitudinal beams, the seven cap beams, the corresponding retaining piles and the lattice columns form a complete frame support system. The pipeline protection construction structure is set based on the frame support system, including: The first type of protective construction structure at each socket joint between pipelines is composed of a first steel casing, a first suspension structure, and a first fireproof rock wool layer. The first steel casing is composed of two first sub-casings split into two along the central axis direction and spliced ​​through a flange via a first round steel screw. It is tightly fitted on the socket joints of two adjacent sections of the pipeline, and a first fireproof rock wool layer is arranged between the outer wall of the pipeline, and the bottom end is tightly attached to the corresponding cap beam. The first suspension structure includes a first suspension beam and a plurality of the first round steel screws. The first suspension beam is fixedly mounted between the top ends of a plurality of support members spaced apart along the lengthwise direction at the top ends of two rows of longitudinal beams. The first round steel screw thread is vertically penetrated between the first suspension beam and the flange of the first steel casing, and is respectively fastened by a first nut; The second type of protection construction structure at each standard section of the pipeline is distributed in multiple groups at equal intervals along the length of the pipeline on the standard section of the pipeline between two adjacent first type protection construction structures. Each group is composed of a second steel casing, a second suspension structure, and a second fireproof rock wool layer. The second steel casing is composed of two second sub-casings that are split into two parallel to the axial direction and spliced ​​through a flange through a second round steel screw. It is tightly fitted on the standard section of the pipeline, and a second fireproof rock wool layer is arranged between the outer wall of the pipeline. The bottom end is tightly attached to the corresponding cap beam. The second suspension structure includes a second suspension beam and a plurality of second round steel screws. The second suspension beam is fixedly mounted between the tops of a plurality of supporting members spaced apart along the length at the tops of the two rows of longitudinal beams. The second round steel screw thread is vertically penetrated between the second suspension beam and the flange of the second steel casing, and is respectively fastened by a second nut; The third type of protective construction structure at the location where the pipeline meets the pile column is tightly supported on the bottom end of the pipeline by a cap beam, and the gaps on both sides along the horizontal direction between the cap beam and the bottom end of the pipeline are filled with wedge-shaped wooden blocks.

2. The large-diameter water pipe protection construction structure according to claim 1 is characterized in that: The diameter of the tap water pipe is DN1200mm, and the first steel casing and the second steel casing are both rolled from steel plates with a diameter of 1400mm and a thickness of 10mm.

3. The large-diameter water pipe protection construction structure according to claim 1 is characterized in that: The first steel casing covers a length range of 2m along the length of the pipeline, and the second steel casing covers a length range of 0.6m along the length of the pipeline.

4. The large-diameter water pipe protection construction structure according to claim 1 is characterized in that: The first fireproof rock wool layer surrounds the outer wall of the pipe and tightly covers the outer wall of the pipe at the socket joint. It is a 10cm thick fireproof rock wool. The second fireproof rock wool layer surrounds the outer wall of the pipe and tightly covers the outer wall of the pipe at the standard section. It is a 10cm thick fireproof rock wool.

5. The large-diameter water pipe protection construction structure according to claim 1 is characterized in that: The supporting structure includes a steel pad and an I-beam. A section of the I-beam is erected, and the bottom end is welded to the longitudinal beam through a steel pad. It is as wide as the longitudinal beam, inserted into the soil layer to a depth of 4.5m, and the top elevation is 0.1m higher than the top elevation of the pipeline.

6. The large-diameter water pipe protection construction structure according to claim 1 or 5, characterized in that: Corresponding to the first type of protective construction structure at each socket joint, multiple supporting members are arranged at intervals within a length of 1.5m along the long direction of the pipeline; corresponding to the second type of protective construction structure at each standard section, multiple supporting members are arranged at intervals within a length of 0.5m along the long direction of the pipeline.

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